Index: head/sys/conf/kmod.mk
===================================================================
--- head/sys/conf/kmod.mk
+++ head/sys/conf/kmod.mk
@@ -524,13 +524,13 @@
 	sh ${SYSDIR}/kern/genassym.sh genassym.o > ${.TARGET}
 genassym.o: ${SYSDIR}/${MACHINE}/${MACHINE}/genassym.c offset.inc
 genassym.o: ${SRCS:Mopt_*.h}
-	${CC} -c ${CFLAGS:N-flto:N-fno-common} \
+	${CC} -c ${CFLAGS:N-flto:N-fno-common} -fcommon \
 	    ${SYSDIR}/${MACHINE}/${MACHINE}/genassym.c
 offset.inc: ${SYSDIR}/kern/genoffset.sh genoffset.o
 	sh ${SYSDIR}/kern/genoffset.sh genoffset.o > ${.TARGET}
 genoffset.o: ${SYSDIR}/kern/genoffset.c
 genoffset.o: ${SRCS:Mopt_*.h}
-	${CC} -c ${CFLAGS:N-flto:N-fno-common} \
+	${CC} -c ${CFLAGS:N-flto:N-fno-common} -fcommon \
 	    ${SYSDIR}/kern/genoffset.c
 
 CLEANDEPENDFILES+=	${_ILINKS}